Aramid fiber and viscose fiber core-spun and wrapped AB double-filament composite yarn and manufacturing process

Abstract

The invention discloses an aramid fiber and viscose fiber core-spun and wrapped AB double-filament composite yarn and a manufacturing process, and relates to the technical field of textile production, aramid fibers and viscose fibers are mixed to prepare carded cotton slivers, the carded cotton slivers are mixed and combined to prepare roving slivers, the roving slivers are fed and drafted on a ring spinning frame, and core yarn polyester filament yarns and wrapping yarn polyamide filament yarns are introduced to prepare the AB double-filament core-spun and wrapped composite yarn. The content of aramid fibers is 20-40%, the content of viscose is 10-30%, the content of polyester is 20-30%, and the content of The aramid fiber and viscose fiber core-spun and wrapped AB double-filament composite yarn is successfully produced through the process steps of raw material opening, carding, straightening, combining, drafting and core-spun and wrapped by two kinds of different wrapping fibers with large performance difference, high specific resistance and poor cohesive force, the aramid fiber and viscose fiber core-spun and wrapped AB double-filament composite yarn is high in strength, little in hairiness and compact in yarn body, the fabric is used as a fire-fighting, fireproof and flame-retardant tool, and the production cost is reduced. The fabric has the characteristics of high temperature resistance, fire resistance, high strength and wear resistance, and enriches the market of fire-fighting fireproof flame-retardant textiles.

Description

Technical Field

[0001] This invention relates to the field of textile production technology, specifically to a core-wound AB double-filament composite yarn made of aramid and viscose fibers and its manufacturing process. Background Technology

[0002] With the development of textile technology and the diverse applications of fiber materials, spinning yarns with multiple functions by combining fibers with different functions is the current development trend in the textile industry. Currently, core-spun yarns on the market are all spun from the same type of filament through a core-spun structure. Although they are stronger than monofilament core-spun yarns, their outer covering fiber has a single function and lacks diversified functions, failing to meet the diversified needs of the textile market.

[0003] As a type of synthetic fiber, aramid fiber generally refers to aromatic polyamide fiber. Due to the orderly arrangement of aramid molecular bundles along the fiber axis in its fiber structure, the fiber has high strength and elastic modulus. It is not easy to organically integrate with other fibers during the spinning process, and its high strength, wear resistance, flame retardancy and fire prevention functions cannot be effectively applied in the market.

[0004] This invention aims to explore the production of core-wrapped AB double-filament composite yarn by blending aramid and viscose fibers, in order to enrich the fire protection textile market. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the purpose of this invention is to provide an aramid and viscose fiber core-wound AB double filament composite yarn and its manufacturing process, so as to solve the structural problems of core-wound yarn with different fiber characteristics, avoid the disadvantages of traditional core-wound yarn with single performance and limited function, and realize the normal production of workwear yarn with high temperature resistance, fire resistance, high strength and wear resistance.

[0006] To achieve the above-mentioned objectives, this invention provides an aramid and viscose fiber core-spun and wrapped AB double-filament composite yarn and its manufacturing process. The aramid and viscose fiber core-spun and wrapped AB double-filament composite yarn is made by mixing aramid and viscose fibers to form a carding sliver, which is then mixed and made into a roving sliver. The roving sliver is fed into the drafting machine on a ring spinning machine, while a core polyester filament and a wound nylon filament are introduced to form the AB double-filament core-spun and wrapped composite yarn.

[0007] In the aramid and viscose fiber core-wound AB double filament composite yarn, the aramid fiber content accounts for 20%-40% of the total weight of the blended yarn, the viscose fiber content accounts for 10%-30% of the total weight of the blended yarn, the A polyester filament accounts for 20%-30% of the total weight of the blended yarn, and the B nylon filament accounts for 20%-30% of the total weight of the blended yarn.

[0008] The A polyester filament is selected from 30D to 100D, and the B nylon filament is selected from 30D to 100D.

[0009] Furthermore, a manufacturing process for a core-wound AB double-filament composite yarn of aramid and viscose fibers includes the following steps:

[0010] ① Pretreatment of aramid fiber raw materials: Open the spinnable aramid raw materials, spray with a mixed solvent consisting of 4.0% FK-305 antistatic agent, 4.0% spinning oil agent CP, 0.2% cohesive agent PS, and 6.0% warm water, and seal the film for 24 hours to cure, so that the resistivity of the aramid fiber raw materials before machine reaches below 106Ω·cm, and the moisture regain is 6%-10% before machine operation;

[0011] ② Cleaning process: The pretreated aramid fibers and viscose fibers are mixed in the cleaning tank to form a roll of a certain weight. The roll has a light weight of 330g / m. The carding beater speed is selected as 460rpm, the combined beater speed is 820rpm, and the roll forming roller speed is 12.2rpm. A single-axis flow cotton opener with one opening point is used, and the vibrating cotton box self-adjusts and evens the cotton to form the roll.

[0012] ③ Carding process: Aramid and viscose fibers are carded into carded sliver on the A186D carding machine. The sliver weight is 17.0g / 5m, the total draft ratio is 94 times, the cylinder speed is 360rpm, the licker-in speed is 560rpm, the cylinder card cloth is AC2520-1660, the licker-in card cloth is AT5010-8030, the flats linear speed is 94mm / min, and the dust removal knife height is flush with the machine frame at an angle of 90°.

[0013] ④ Drawing process: Two drawing passes are performed on an RD221C self-regulating leveling drawing frame, using a positive drafting process. The first pass has 6 drawn fibers, a basis weight of 17.5g / 5M, and a total draft ratio of 5.83 times. The draft ratio in the back zone is 1.7 times, and the draft ratio in the front tension zone is 1.02 times. The parallel straightness of the finished fibers is maintained, the roller grip distance is 57mm×60mm, and the pressure roller linear speed is 300m / min.

[0014] The final drawing process uses 8 slivers combined, with a basis weight of 17.0 g / 5 m, a total draft ratio of 8.24, a back zone draft ratio of 1.3, a front tension draft ratio of 1.01, and controls the unevenness of long segments. The roller grip distance is 54 mm × 60 mm, and the pressure roller linear speed is 300 m / min.

[0015] ⑤ Roving process: The roving weight is 5.0g / 10m, the draft ratio is 6.8 times, the back zone draft ratio is 1.30, the twist coefficient is 74, the roller spacing is 23mm×28mm×30mm, the spindle speed is 600 rpm, a 16-tooth false twister with increased friction is selected, and the channel is kept smooth.

[0016] ⑥ Spinning process: A CNC double-filament core-spun yarn device is installed. Aramid and viscose blended roving is fed into the bell mouth of the back zone of the spinning process, and A and B double filaments are fed into the nip mouth respectively. A polyester filament is located in the middle of the roving sliver as the core filament, and B nylon filament is located to the left of A polyester filament as the winding filament. A guide wheel with a center distance of 4mm is selected to make the core filament and the winding filament form a wrapping angle. B nylon filament wraps around the outer surface of the yarn body to bind the short fiber hairs. The spinning twist coefficient is selected as 260-300, the back zone draft ratio is selected as 1.25 times, the spacer block is 4.0, and W321 corrugated cross-section steel wire traveler is selected to increase heat dissipation. The weight of the steel wire traveler is one level heavier than that of conventional yarn. The yarn type is PG1 / 2-38 series, the spindle speed is 8000rpm, and the filament draft ratio is 1.02 times.

[0017] ⑦ Winding process: The automatic winding machine speed is 1400m / min. The electric cleaning process is set to neps of 320% and long thick knots of 140%-1.8. It removes bubble yarn and harmful short thick knots caused by fly waste and poor drafting. The fineness of long thin knots is 18% and the length is 32cm. It removes core-leaking yarn and coreless yarn. The empty twist knots are good, with no breakage and poor twist strength.

[0018] Furthermore, the aramid and viscose fiber core-wound AB double filament composite yarn has a strength of 19.7 Tex; the resistivity of the aramid fiber raw material is 108 Ω·cm.

[0019] Furthermore, a core-wound AB double-filament composite yarn made of aramid and viscose fibers and its manufacturing process are described below, including the equipment configuration and process flow for each step:

[0020]

[0021] Compared with existing technologies, this invention provides a core-wound AB twin-filament composite yarn of aramid and viscose fibers and its manufacturing process. By combining two fibers with significantly different properties (high resistivity and poor cohesion), through processes such as raw material opening, combing, straightening, combining, stretching, and core-wound, this invention successfully produces aramid and viscose fiber core-wound AB twin-filament composite yarn. This avoids the difficulties of easy entanglement and fiber absorption during the spinning process of fibers with different properties. The produced AB twin-filament composite yarn has high strength, low hairiness, and a compact yarn body. When used as fire-resistant and flame-retardant workwear, the fabric possesses characteristics of high-temperature fire resistance, high strength, and wear resistance, enriching the market for fire-resistant and flame-retardant textiles. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to examples.

[0023] This invention discloses an aramid and viscose fiber core-spun and wrapped AB double-filament composite yarn and its manufacturing process. The aramid and viscose fiber core-spun and wrapped AB double-filament composite yarn is made by mixing aramid and viscose fibers to form a carded sliver, which is then mixed and made into a roving sliver. The roving sliver is fed into the drafting machine on a ring spinning machine equipped with a filament drafting device, while a core polyester filament and a wound nylon filament are introduced to form the AB double-filament core-spun and wrapped composite yarn. It has the characteristics of high strength, low hairiness, and compact yarn body. The fabric made from it has high strength, wear resistance, flame retardancy, and fireproof properties.

[0024] In the aramid and viscose fiber core-wound AB double filament composite yarn, the aramid fiber content accounts for 20%-40% of the total weight of the blended yarn, the viscose fiber content accounts for 10%-30% of the total weight of the blended yarn, the A polyester filament accounts for 20%-30% of the total weight of the blended yarn, and the B nylon filament accounts for 20%-30% of the total weight of the blended yarn.

[0025] The A polyester filament is selected from 30D to 100D, and the B nylon filament is selected from 30D to 100D.

[0026] Practice has shown that when both the core and winding yarns of a double-filament composite yarn are made of polyester, its abrasion resistance is poor and dyeing is difficult; when both the core and winding yarns are made of nylon, the strength cannot meet the requirements of workwear. This invention selects polyester as the core yarn and nylon as the winding yarn. Polyester filaments have high strength and high modulus, while nylon filaments have excellent abrasion resistance. Using two different types of filaments balances both strength and abrasion resistance. Combined with the flame-retardant properties of the outer aramid coating and the soft, moisture-wicking, and skin-friendly properties of the viscose, it possesses fire-retardant and high-temperature resistance properties, good wearing comfort, abrasion resistance, and high strength, better meeting the comprehensive requirements of special clothing for flame retardancy, fire resistance, high strength, and abrasion resistance, making it suitable for manufacturing flame-retardant workwear. The aramid configured in this invention has good flame retardancy and fire resistance, with a limiting oxygen index (LOI) of 29%-32%, exhibiting excellent performance.

[0027] The aramid and viscose fiber core-wound AB bifilament composite yarn described in this invention can be any one of the groups in the embodiments in Table 1:

[0028] Table 1

[0029] Aramid fiber content % viscose fiber content % Polyester filament content % Nylon filament content % Example 1 30 20 25 25 Example 2 20 30 25 25 Example 3 30 20 20 30 Example 4 30 20 30 20 Example 5 25 25 25 25 Example 6 40 10 25 25 Example 7 40 10 20 30 Example 8 40 10 30 20 Example 9 20 30 20 30 Example 10 20 30 30 20 Example 11 35 15 25 25 Example 12 35 15 20 30 Example 13 35 15 30 20

[0030] Preferably, a manufacturing process for a core-wound AB double-filament composite yarn of aramid and viscose fibers includes the following steps:

[0031] ① Pretreatment of Aramid Fiber Raw Materials: Aramid raw materials have a resistivity of around 108 Ω·cm, resulting in poor spinnability, easy entanglement, and easy fiber absorption. To improve the spinnability and openness of aramid raw materials, a mixed solvent consisting of 4.0% FK-305 antistatic agent, 4.0% spinning oil CP, 0.2% cohesive agent PS, and 6.0% warm water is sprayed onto the raw materials. The mixture is then sealed in a film and left to cure for 24 hours. This process aims to achieve a resistivity of less than 106 Ω·cm for the aramid fiber raw materials before spinning, with a moisture regain of 6%-10%, meeting the spinning requirements.

[0032] ② Cleaning process: The pretreated aramid fibers and viscose fibers are mixed in proportion on the FA002A cotton picker in the cleaning machine to form a lap of a certain weight, with a light weight of 330g / m. The carding beater speed of the A035C cotton opener (equipped with A045B cotton condenser) is 460rpm. The fibers are further mixed and opened by the FA106C multi-compartment mixing opener (equipped with A045B cotton condenser). The combined beater speed of the FA076C lap forming machine is 820rpm, and the lap forming roller speed is 12.2rpm. Both fibers are of equal length. The cleaning process is short, using a single-axis flow cotton opener with one opening point. The vibrating cotton box self-adjusts and evens the cotton before lap forming.

[0033] ③ Carding process: Aramid and viscose mixed fibers are carded into carded sliver on the A186D carding machine. The sliver weight is 17.0g / 5m, the total draft ratio is about 94 times, the cylinder speed is 360rpm, the licker-in speed is 560rpm, the cylinder card cloth is AC2520-1660 to increase the fiber carding penetration, the licker-in card cloth is AT5010-8030 to reduce the tooth density and reduce fiber damage, the flat plate linear speed is 94mm / min, and the dust removal knife height is flush with the machine frame at an angle of 90°.

[0034] ④ Drawing process: Two drawing passes are performed on the RD221C self-regulating leveling drawing frame, using a positive drafting process. The first pass combines 6 fibers with a basis weight of 17.5g / 5M and a total draft ratio of 5.83. The draft ratio in the back zone is 1.7, and the draft ratio in the front tension zone is 1.02. This process enhances fiber mixing, improves fiber parallelism and straightness, and reduces nipple swelling caused by drafting. The roller grip distance is 57mm×60mm, and the pressure roller linear speed does not exceed 300m / min.

[0035] The final drawing process uses 8 slivers combined, with a basis weight of 17.0 g / 5 m, a total draft ratio of 8.24, a rear zone draft ratio of 1.3, and control of long segment unevenness. The front tension draft ratio is 1.01, and the long segment unevenness is also controlled. The roller grip distance is 54 mm × 60 mm, the pressure roller linear speed is 300 m / min, and the overall cradle pressure is moderate.

[0036] ⑤ Roving process: The roving weight is 5.0g / 10m, the draft ratio is 6.8 times, the back zone draft ratio is 1.30, the twist coefficient is 74, the roller spacing of the FA426E roving frame is 23mm×28mm×30mm, the spindle speed is 600 rpm, a 16-tooth false twister with increased friction is selected, and the channel is kept smooth to produce roving with compact and bright yarn.

[0037] ⑥ Spinning Process: A CNC double-filament core-spun yarn device is installed on the DTM129 ring spinning frame. Aramid and viscose blended roving is fed into the bell mouth of the spinning back zone, and A and B double filaments are fed into the nip mouth respectively. The A polyester filament is placed in the middle of the roving sliver as the core yarn, which can increase the yarn strength. The B nylon filament is placed to the left of the A polyester filament as the winding yarn. A guide wheel with a center distance of 4mm is selected to make the core yarn and the winding yarn form a wrapping angle, so that the B nylon filament wraps around the outer surface of the yarn body and binds the short fibers. Hairiness can increase yarn breaking elongation and abrasion resistance. The fine yarn twist coefficient is selected as 260-300, the back zone draft ratio is selected as 1.25 times, the spacer block is 4.0, and W321 corrugated cross-section steel traveler is used to increase heat dissipation. The steel traveler is one level heavier than that of conventional yarn. The yarn type is PG1 / 2-38 series. The spindle speed is controlled not to exceed 8000rpm. The filament draft ratio is 1.02 times, which can accommodate both polyester and nylon. The tension is moderate to avoid excessive tension forming bubbles and thick spots.

[0038] ⑦ Winding process: The speed of the Cilaifu AC338 automatic winding machine is 1400m / min. The electric cleaning process is set to neps of 320% and long thick knots of 140%-1.8, removing bubble yarn and harmful short thick knots caused by fly waste and poor drafting; the fineness of long thin knots is 18% and the length is 32cm, removing core-exposed yarn and coreless yarn; the empty twist knots are good, with no disconnection or poor twist strength.

[0039] Preferably, an aramid and viscose fiber core-spun AB bifilament composite yarn and its manufacturing process are described, wherein the aramid and viscose fiber core-spun AB bifilament composite yarn is 19.7Tex.

[0040] Preferably, an aramid / viscose fiber core-wrapped AB double-filament composite yarn and its manufacturing process utilize general cotton spinning equipment, except for the spinning process which requires an additional CNC double-filament core-wrapped yarn device. This equipment offers strong production adaptability. The parameters in each process are determined based on the fiber characteristics of the selected yarn count, yarn weight, and equipment type, all ensuring the normal production of 19.7Tex core-wrapped yarn. The equipment configuration and process flow for each process are as follows:

[0041]

[0042] The values ​​of other process parameters are selected with reference to the values ​​described in the process description of this invention.

[0043] Due to its high resistivity, the aramid fiber of this invention is difficult to spin. By adding antistatic agents and oils for pretreatment during the opening process, the viscose becomes soft. During the opening and carding processes, care is taken to gently strike and slowly comb to reduce the generation of neps and cloud spots, and to reduce the growth of short fibers. By straightening the fibers, the two fibers complement and blend with each other during drafting. The fine yarn is introduced with core yarn and winding yarn respectively, so that the yarn achieves the purpose of high strength, wear resistance, flame retardancy, fire prevention and excellent wearability.

[0044] Table 2 below shows the test data of the core-wrapped yarn with a content of 35% aramid, 15% viscose, 25% polyester filament core yarn, and 25% nylon filament winding yarn produced by the manufacturing process of the present invention:

[0045] Table 2

[0046]

[0047] Table 2 shows that the aramid and viscose fiber core-wound AB double filament composite yarn produced by the manufacturing process of this invention has significantly improved yarn strength, meeting the strength requirements of workwear fabrics.

Claims

1. A core-wound AB double filament composite yarn of aramid and viscose fibers and its manufacturing process, characterized in that: The AB double-filament composite yarn with aramid and viscose fiber core-wound is made by mixing aramid and viscose fiber to form a carding sliver, which is then mixed and made into a roving sliver. The roving sliver is fed and drafted on a ring spinning machine, while the core polyester filament and the wound nylon filament are introduced to form the AB double-filament core-wound composite yarn. In the aramid and viscose fiber core-wound AB double filament composite yarn, the aramid fiber content accounts for 20%-40% of the total weight of the blended yarn, the viscose fiber content accounts for 10%-30% of the total weight of the blended yarn, the A polyester filament accounts for 20%-30% of the total weight of the blended yarn, and the B nylon filament accounts for 20%-30% of the total weight of the blended yarn. The A polyester filament is selected from 30D to 100D, and the B nylon filament is selected from 30D to 100D.

2. The manufacturing process of the aramid and viscose fiber core-wound AB double filament composite yarn according to claim 1 includes the following steps: ① Pretreatment of aramid fiber raw materials: Open the spinnable aramid raw materials, spray with a mixed solvent consisting of 4.0% FK-305 antistatic agent, 4.0% spinning oil CP, 0.2% cohesive agent PS, and 6.0% warm water, and seal the film for 24 hours to cure, so that the resistivity of the aramid fiber raw materials for use on the machine reaches 10 ohms. 6 Below Ω·cm, moisture regain is 6%-10% after machine use; ② Cleaning process: The pretreated aramid fibers and viscose fibers are mixed in the cleaning tank to form a roll of a certain weight. The roll has a light weight of 330g / m. The carding beater speed is selected as 460rpm, the combined beater speed is 820rpm, and the roll forming roller speed is 12.2rpm. A single-axis flow cotton opener with one opening point is used, and the vibrating cotton box self-adjusts and evens the cotton to form the roll. ③ Carding process: Aramid and viscose fibers are carded into carded sliver on the A186D carding machine. The sliver weight is 17.0g / 5m, the total draft ratio is 94 times, the cylinder speed is 360rpm, the licker-in speed is 560rpm, the cylinder card cloth is AC2520-1660, the licker-in card cloth is AT5010-8030, the flats linear speed is 94mm / min, and the dust removal knife height is flush with the machine frame at an angle of 90°. ④ Drawing process: Two drawing passes are performed on an RD221C self-regulating leveling drawing frame, using a positive drafting process. The first pass has 6 drawn fibers, a basis weight of 17.5g / 5M, and a total draft ratio of 5.83 times. The draft ratio in the back zone is 1.7 times, and the draft ratio in the front tension zone is 1.02 times. The parallel straightness of the finished fibers is maintained, the roller grip distance is 57mm×60mm, and the pressure roller linear speed is 300m / min. The final drawing process uses 8 slivers combined, with a basis weight of 17.0 g / 5 m, a total draft ratio of 8.24, a back zone draft ratio of 1.3, a front tension draft ratio of 1.01, and controls the unevenness of long segments. The roller grip distance is 54 mm × 60 mm, and the pressure roller linear speed is 300 m / min. ⑤ Roving process: The roving weight is 5.0g / 10m, the draft ratio is 6.8 times, the back zone draft ratio is 1.30, the twist coefficient is 74, the roller spacing is 23mm×28mm×30mm, the spindle speed is 600 rpm, a 16-tooth false twister with increased friction is selected, and the channel is kept smooth. ⑥ Spinning process: A CNC double-filament core-spun yarn device is installed. Aramid and viscose blended roving is fed into the bell mouth of the back zone of the spinning process, and A and B double filaments are fed into the nip mouth respectively. A polyester filament is located in the middle of the roving sliver as the core filament, and B nylon filament is located to the left of A polyester filament as the winding filament. A guide wheel with a center distance of 4mm is selected to make the core filament and the winding filament form a wrapping angle. B nylon filament wraps around the outer surface of the yarn body to bind the short fiber hairs. The spinning twist coefficient is selected as 260-300, the back zone draft ratio is selected as 1.25 times, the spacer block is 4.0, and W321 corrugated cross-section steel wire traveler is selected to increase heat dissipation. The weight of the steel wire traveler is one level heavier than that of conventional yarn. The yarn type is PG1 / 2-38 series, the spindle speed is 8000rpm, and the filament draft ratio is 1.02 times. ⑦ Winding process: The automatic winding machine speed is 1400m / min. The electric cleaning process is set to neps of 320% and long thick knots of 140%-1.

8. It removes bubble yarn and harmful short thick knots caused by fly waste and poor drafting. The fineness of long thin knots is 18% and the length is 32cm. It removes core-leaking yarn and coreless yarn. The empty twist knots are good, with no breakage and poor twist strength.

3. The aramid and viscose fiber core-wound AB double filament composite yarn and its manufacturing process according to claim 1, characterized in that: The aramid and viscose fiber core-wound AB bifilament composite yarn has a resistivity of 19.7 Tex; the resistivity of the aramid fiber raw material is 10 Ω·cm. 8 Ω·cm.

4. The aramid and viscose fiber core-wound AB double filament composite yarn and its manufacturing process according to claim 2, characterized in that: The equipment configuration and process flow for each step are as follows:

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